Jeddah's early August temperatures are shaped by peak summer solar insolation under persistent subtropical high pressure, clear skies, and minimal precipitation typical of the Red Sea coastal climate, where historical August mean daily maxima reach 38–39 °C with occasional spikes above 42 °C. Short-term model guidance as of August 2, 2026, points to highs in the upper 30s to low 40s °C for August 4, consistent with recent late-July observations near 42 °C and long-term climatology showing low day-to-day variability in this arid regime. These conditions underpin the market's heavy weighting toward 39 °C and above (roughly 69 % combined implied probability), while the spread across 38–40 °C outcomes reflects residual uncertainty in exact steering flows and local heat advection that official forecasts from agencies such as the Saudi National Center for Meteorology will refine over the next 48 hours.